## <fn>

    $1:
        -h   :help
        _go  :edit dir with <fn>
        _tst :exec exec.tst as mane test functions
        --_<cntl_value> <value> - that means (<cntl_value>_=<value>) in functon
        -_<cntl_value>  - that means (<cntl_value>_=1) in functon